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Thermal analysis of 2-oxocyclopentanedithiocarboxylato complexes of iron(iii), copper(ii) and zinc(ii) containing pyridine or morpholine as the second ligand

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Abstract

A series of ternary complexes of the types M2L′2L″2;ML′2L″2 (M=Fe, Cu, Zn; L′=2-oxocyclopentane dithiocarboxylate; L″=pyridine, morpholine) and CuL′2H2O was prepared afresh. Except the iron complex, all are dimer and complexation is through the dithio moiety of the ligand L′. Their thermal decomposition was carried out in air at heating rate 10°C min−1 and it revealed that the dehydration of the aqua complex follows the same path as the carboxylates and the pyridine complexes have the tendency to follow one-step decomposition. The copper complexes are less thermally stable. The overall thermal stability of the 2-oxocyclopentanedithiocarboxylato complexes of the three metals with the volatile ligands was found to be in the order: (CuLmorph)2< CuL2H2O<(CuLpy)2<(ZnLmorph)2<(ZnLpy)2<FeL2py2. The thermogravimetric properties of the complexes have been studied and the data were subjected to kinetic analysis. The values of n, E, A and ΔS# have been approximated and compared. Any formation of bridged structure is not indicated in the first step case.

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Authors and Affiliations

  1. University Department of Chemistry, Magadh University, Bodh Gaya, 824234, India

    R. K. Verma, L. Verma, M. Ranjan & B. P. Verma

  2. Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College St., Toronto, ON, M5S 3E5, Canada

    S. C. Mojumdar

  3. University of New Brunswick, Saint John, NB, E2L 4L5, Canada

    S. C. Mojumdar

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  1. R. K. Verma
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  2. L. Verma
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  3. M. Ranjan
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  4. B. P. Verma
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  5. S. C. Mojumdar
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Correspondence to R. K. Verma.

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Verma, R.K., Verma, L., Ranjan, M. et al. Thermal analysis of 2-oxocyclopentanedithiocarboxylato complexes of iron(iii), copper(ii) and zinc(ii) containing pyridine or morpholine as the second ligand. J Therm Anal Calorim 94, 27–31 (2008). https://doi.org/10.1007/s10973-008-9183-z

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